A potentiometer circuit is set up as shown.The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0A when two way key is switched off.The balance points, when the key is switched off.The balance points, when the key between the terminals (i) 1 and 2 (ii) 1and 3, is plugged in, are found to be at lengths l1cm and l2cm respectively.The magnitudes, of the resistors R and X, in ohm, are then, equal, respectively, to

(a)kl2-l1 and kl2

(b)kl1 and kl2-l1

(c)kl2-l1and kl1

(d)kl1 and kl2

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